| Spread.Sheets Documentation > Developer's Guide > Managing the User Interface > Using Formulas > Creating Custom Formulas |
If you have functions that you use on a regular basis that are not in the built-in functions or if you wish to combine some of the built-in functions into a single function, you can do so by defining your own custom functions. They can be called as you would call any of the built-in functions.
This example creates a custom function.
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| var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3}); var activeSheet = spread.getActiveSheet(); // Add Custom function // Type =myfunc(1) // in a cell to see the result function myfunc() {} myfunc.prototype = new GC.Spread.CalcEngine.Functions.Function("myfunc", 0, 0, {name: "myfunc",description: "This is my first function"}); myfunc.prototype.evaluate = function (args) { return 100; spread.addCustomFunction(new myfunc()); |
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